Brake



May 30, 1933- l.. E. LA BRIE 1,911,452

. BRAKE Filed Aug: '30, 1929 INVENToR;

' mty@ J0' 3 ATTO EY.

Patented May 3o, 1933 'y UNITED A-sT'aTEs PATENT OFFICE LUDGEB Il. LABRIE.' OF SOUTH BEND, INDIANA, LBSIGNOR TO BENDII BRAKE4 OOIPA-NY, I'SOUTH BEND, INDIANA, ,L CORPORATION 0l' ILLINOIS appumm mangue ao, maserial 1u. suesse.

This invention relates to brakes and is illustrated as embodied in aninternal expanding automobile brake of the full-wrapping type inwhichthe friction means anchors at one end when the drum is turning inone d1- rection and at the other end when the drum is turning in theother direction. p

An ob3ect of the invention is to improve both ,the operatin andanchoring lmeans of the brake and to acilitate its adJustment.

Preferably the brake includes operating meanssuch as a tog le arran edin a plane parallel with the ane of t e brake and which is operable mentconnected thereto. The toggle operating means which is preferablyarranged at one side of the brake serves to expand the separated ends ofan `annular friction element2 which ends are adapted to anchrrespectively through a movable link placed in tension and a stampingsuch as an angle iron rigidly secured to the brake support. Thus in onedirection ofdrum rotation the braking to ue is taken by the tensionmeans and wit the reverse direction of rotation the fixed abutment takesthe torque.

vable wedge member ada ted to abut.

A further object of the invention resides in the provision of a noveladjustment for the friction element at one end thereof and whichadjustmentv comprises relatively movable 'uxtaposed plates, ,therelative sition of w 'ch 1s determined by a lateral movportions at theends of s ots in the-respective plates, the reaction of the wedge memberin orcing the plates apart being taken by a cu -shaped washer memberabutting one vof said lates. Y

Ot er objects and "features of the invention, including an alarmstructure co-operating with the aforementioned washer indicating to theoperator the position of the adjusting means; also afnovel arrangementof Ey a fiexible tension elei Veledthe ends of the band.

Figure 1 is a vertical section through the brake 'ust inside the head ofthe brake drum, and s owing the brake friction means in side elevation;

Fi ure 2 is a partial transverse section, on the hne 2--2 of Figure 1through the novel ad'ustment of the brake; and igure 3 is a partialsection, taken on the line 3 3 of Figure 1, showin in detail theanchoring structure for one en of the brake.

In the illustrated and preferred vembodiment of the invention, thebrakedncludes a rotatable drum at the o en side of which is a supportsuch as a bac ing late 12 and within which is arran ed the frictionmeans ing device such as an ex ansible iexible band 14 provided on itsrim face in theform shown with friction lining l'riveted or otherwisesecured thereto,A

The idle position of the band 14 with the brake released is determinedby novel adjustable stops such as disks 18 eccentrically secured to pins20 secured to the backin plate, the disks contacting the inner face othe band 14 and when rotated serving to forcethe same outwardl todetermine. the released position of the and under the action of springs22 and 24. Three such eccentrics are employed one each at the ends ofthe band and onepositioned substantially ydiametrically opposite theopening between The band 14 is separated to contact the rotating drum bymeans of a novel toggle preferably arranged at the front of the brake,that is, at one end of a horizontal diametrical line in the rleft frontbrake disclosed in Fi re 1. The toggle may consist 0f links 26 and 28,each link comprising par allel stampings pivotaly connected at theiradjacent knuckle endsand arranged to'be actuated bya tension linkpivotally secured to the knuckle and at itsother end to a verticallyextending applying lever 32 fulbacking plate-12, which lever ispreferably actuated by a flexible tension element 36` piv'otally securedthereto and extending through the plate 12 to be connected to theJservice pedal or other power source.

The link 26 of the toggle is pivotally connected to a pin 38 (Figure 3)passing through a reinforcing web 40 rigidly secured to one end of theband 14. With the wheel rotatin in the direction of the arrow in Fi ure1 thatI is, with the vehicle moving orward), the torque of the band istaken directly on pin 38 upon which are pivotally mounted parallelanchoring tension links 42 pivotally secured at their ends to ananchorpin 44 rigidly secured to the support plate 12.- The anchor linksare preferably slotted at 46 to permit movement of the band with its pinin the direction to anchor on its other end and the web of the shoe at48 is slotted about the anchor pin to .closed in Fi ure 2,

permit this reverse movement. This particular type of tension linkanchor is more particularly described and claimed in 'co-' pendingapplications of Roy S. Sanford No. 388,348 filed August the 26th, 1929,and Humphrey F. Parker No. 381,195 filed Jul-y the 26th, 1929. Relativeto this structure, itis to be noted that the eccentric adjustment pin 20is passed through reinforcing plates 50 secured. to the backing plate atthe anchor According to a very important feature of my invention,the`overall length of the band between itsconnections to the togglelinks may be increased by a novel adjustment structure to compensate forthe wear of the friction lining, thus preserving the relative angularityof the links of the toggle and their position with respect to theremainder of the actuating mechanism. This articular construction, asmore complete y ,dis-

referably comprises a relatively l s ort ra ially extending web member52 welded or otherwise permanently f secured to the inner face of theband 14 at its lower end (Figure 1). A similar plate. 54 substantiallyco-extensive in length with said plate 52 is preferablymounted parallelandv in juxtaposition therewith and relatively movable thereto by meansof 'pins 56 fixedly -secured to the plate 52 and passing through slotsin the plate 54. These ins which are provided with `washers 58 sliding--ly contacting the sides of the plate 54 'provide a slightly loose fittopermit the relative sliding movement of the two plates to effect thedesired adjustment; This adjustment may be effected by a wedge-shapedmember'60 threadedly mounted on the end` of a set screw 62, thehex headof the latter positioned opposite an opening 64 in the i acking plate topermit rotation of the same from outside the-brake. The faces of ythewedge preferably abutbeveled portions sha ed slots therein toaccommodate the we ge. A cup-shaped washer member 69 rectangular inperipheral outline may be provided with a circular opening toaccommodate the headed end ofthe setscrew 62, one side of the washeradapted to contact with the inner face of the band, as shown in Figure1, to obviate turningmovement of the washer.

In order to indicate to the operator the degree of an ular movement ofthe set screw in effecting t ie adjustment, there is provided a circularwasher member 70 having a polygonal shaped opening adapted to surround acorrespondingly shaped shoulder on the set screw, said washer being alsoprovided shaped Washer 69.

The end of the adjusting plate 54 is preferably provided with projectionwelded plates 74 on either side thereof to increase the bearing surfacein contact with an angle iron anchor member 75 rigidly secured to thebacking plate and which anchor rmember is slotted to accommodate thethickened endi of the adjusting plate.

In operation, actuation of the flexible tenupon release of the sequentlining wear, it becomes necessary to increase the yoverall length of theband which is readily effected by,tlie' manual adjustment ofthe setscrew 62 to relatively move the plates 52 and '54. The positioning ofthetoggle parts in thel plane of the' brake permits of relatively longlinks forming the same, which reduces to a minimum ythe `flatteningof'the-.'toggle'to efectthe brake application.l Thiais-particularlydesired, inasmuch as the pressure applied at the ends of the togglelinks-isa first derivative of the angularity of the links during thespread of the same.

-While one illustrative embodiment of my invention has been described indetail, it is not lmy intention to limit' thescope of theinvention'tothat particular embodiment or otherwise than by theterms ofthe appended claims."" v y My divisional application #625,137, filedJuly 27,1932, is directed to the subject matlao a relatively short webmember rigidly secured to one end -of the band and provided intermediateits ends with a. slot having at l thereof with a beve havin slotprovided v able wedge 'radial one endl thereof a beveled portion struckout from the web of the plate, a second plate member arran d in abutmentwith and parallel to said rst-mentioned plate and provided with. a.corresponding y shaped and positioned slot also having at' one endthereof an outwardly struck beveled portion, sald beveled portionstogether defining a support for a laterall movable wedge member.

42. A vbrake inc uding a friction element having rigidly secured at oneend thereof a radially extending web plate, a second plate member insliding abutment with the first plate, both plates provided withregistering slots and each slot provided at one en ed portion, togetherwith a laterally movable wedge member sitioned within the slots andadapted to nde on the beveled `portions 4and means for urging said wedgelaterally comprising a bolt having mounted thereon a cup-shaped washermember contactin one of said plates.

- 3. A brake inclu 1n a friction element rigidly secure f at one endthereof a radially extending web plate, a second plate member in sli ingabutment with the lirst plate, both plates 'provided with registeringrectangularly shaped slots and each at one end Athereof with a beveledportion, together with'a laterally movmember itioned within the slotsand adapted to ride on the beveled portions and means for urging saidwedge laterally comprising a bolt having mounted thereon a cu -shap'edwasher member-contacting one o said plates.

4. A brake including a friction element having y extending web plate, asecond plate member in sliding abutment with the first plate, bothplates provided with registering slots and each slot provided at one endthereof with a beveled` portion, to her with a laterally movable wedgemem r sitioned within the slots and adapted to nde lon the beveledportions and means for urging said wedge laterally comprising a bolthavingv mounted thereon a cup-shapedwasher 'mem-l ber contacting one ofsaid plates and means supportedl by said bolt for indicating the degreeof angular movement of said bolt.

5. In an adjusting means for a brake friction element, a rotatable bolt,a washer member stationary with respect tosaid bolt and mounted thereon.and enga'ng the 'side of the friction member toget er with means fordetermining the degree of relative moverigidly secured at one endthereof av ment of said parts comprising a member mltedttlalo rolt'gstewithA said' bollt1 and rov1 w1 pa registerin wit o 1n in the washer todetermine'igts positifinrel tive thereto. i

6. In an adjusting means for a brake friction element, a rotatable bolt,a cup-shaped respect to said bolt and mounted thereon, together withmeans for determining the degree of relative. movement of said. partscomprising;l disk'member mounted to rotate with said lt and providedwith parts registering with o nin in the washer to determine itspositlon re ative thereto.

7. A brake comprising a friction element having a slotted web, a membermovable on the web having a slot registering with the slot inthe web anda wedging member movable transversely in the slot.

lwasherv member rectangular in peripheral outline, said member beingstationary withY 8. A brake comprising a friction element Ahaving a webvprovided with a `slot a member movably mounted on the web having a slot-registerin with the slot inl the web, a member mova le transverselyin'the slots, and means associated therewith /for deteri mining therelative movement of the web and 'the member movable thereon.

tering s ots, oppositely arranged bearing surfaces of the res ctiveparts, a member movable transverse yin the slots engaging the bearingsurfaces, a member bridging the slots having a Eluralit of recesses a mesupported y the ridge threaded into the transversely movable member, anda disc carried on the member the brid ble` or engagement with therecesses in the bridge.

In testimony whereof, I have hereunto signed my name.

, LUDGER E. LA BRIE.

with regislos rted b having a pluralitysblfjibsses afptaj 12in

